Invoice Serial Number Automation in Zoho Books

 				 					//Get the Invoice Record  invoiceId = invoice.get("invoice_id");  organizationId = organization.get("organization_id");  invoiceRecord = zoho.inventory.getRecordsByID("Invoices",organizationId,invoiceId);  //Get the Invoice Line Items for later  invoiceItems = invoiceRecord.get("invoice").get("line_items");  //Get the Sales Order Record  salesorderId = invoiceRecord.get("invoice").get("salesorders").get("0").get("salesorder_id");  salesorderRecord = zoho.inventory.getRecordsByID("SalesOrders",organizationId,salesorderId);  //Get all related Packages  packages = salesorderRecord.get("salesorder").get("packages");  //Get a list of all Package Records  packageRecords = List();  for each  p in packages  {  	packageId = p.get("package_id");  	packageRecords.add(zoho.inventory.getRecordsByID("Packages",organizationId,packageId));  }  //Get the item IDs each of the Packages, match them with each of the item IDs in Invoice, then create a map to update the serial numbers in the respective descriptions of each Item in the Invoice  updatelineitems = List();  for each  PR in packageRecords  {  	PackageItems = PR.get("package").get("line_items");  	for each  i in PackageItems  	{  		itemId = i.get("item_id");  		serialNum = i.get("serial_numbers");  		for each  R in invoiceItems  		{  			if(R.get("item_id") = itemId)  			{  				description = serialNum.toString();  				lineItem = Map();  				lineItem.put("description",description);  				lineItem.put("line_item_id",R.get("line_item_id"));  				updatelineitems.add(lineItem);  			}  		}  	}  }  updatemap = Map();  updatemap.put("line_items",updatelineitems);  update = zoho.books.updateRecord("Invoices",organizationId,invoiceId,updatemap);  info update;